On tangential star products for the coadjoint Poisson structure
نویسندگان
چکیده
We derive necessary conditions on a Lie algebra from the existence of a star product on a neighbourhood of the origin in the dual of the Lie algebra for the coadjoint Poisson structure which is both di erential and tangential to all the coadjoint orbits. In particular we show that when the Lie algebra is semisimple there are no di erential and tangential star products on any neighbourhood of the origin in the dual of its Lie algebra. D epartement de Math ematiques Universit e Libre de Bruxelles Campus Plaine CP 218 1050 Bruxelles Belgium D epartement de Math ematiques Universit e de Metz Ile du Saulcy F-57045 Metz cedex France Mathematics Institute University of Warwick Coventry CV4 7AL United Kingdom Research partially supported by EC contract CHRX-CT920050
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